A capacitor is much like a water storage tank. A conductor is something a pipe.
Electrons flow in a conductor. Water flows in pipe. Not exactly the same.
Just like a pipe can fill a storage tank it can also empty the tank.
I do not know which you are talking about.
A inductor is more like a long long pipe. A pipe so long it take time to get water into it and out the other end. When the pipe is flowing it stores water. (not a great example but a start)
Many bigtime semiconductor manufacturers that deal in SMPS components have design sheets and application notes for these exact questions. I would start there for help regarding the devices you're using — if you're currently using any.